Support Smi in CompareIDAndBranch

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2056 matching lines @@
   } else {
     if (instr->is_double()) {
       // Don't base result on EFLAGS when a NaN is involved. Instead
       // jump to the false block.
       __ ucomisd(ToDoubleRegister(left), ToDoubleRegister(right));
       __ j(parity_even, chunk_->GetAssemblyLabel(false_block));
     } else {
       int32_t value;
       if (right->IsConstantOperand()) {
         value = ToInteger32(LConstantOperand::cast(right));
-        __ cmpl(ToRegister(left), Immediate(value));
+        if (instr->hydrogen_value()->representation().IsSmi()) {
+          __ Cmp(ToRegister(left), Smi::FromInt(value));
+        } else {
+          __ cmpl(ToRegister(left), Immediate(value));
+        }
       } else if (left->IsConstantOperand()) {
         value = ToInteger32(LConstantOperand::cast(left));
-        if (right->IsRegister()) {
+        if (instr->hydrogen_value()->representation().IsSmi()) {
+          if (right->IsRegister()) {
+            __ Cmp(ToRegister(right), Smi::FromInt(value));
+          } else {
+            __ Cmp(ToOperand(right), Smi::FromInt(value));
+          }
+        } else if (right->IsRegister()) {
           __ cmpl(ToRegister(right), Immediate(value));
         } else {
           __ cmpl(ToOperand(right), Immediate(value));
         }
         // We transposed the operands. Reverse the condition.
         cc = ReverseCondition(cc);
+      } else if (instr->hydrogen_value()->representation().IsSmi()) {
+        if (right->IsRegister()) {
+          __ cmpq(ToRegister(left), ToRegister(right));
+        } else {
+          __ cmpq(ToRegister(left), ToOperand(right));
+        }
       } else {
         if (right->IsRegister()) {
           __ cmpl(ToRegister(left), ToRegister(right));
         } else {
           __ cmpl(ToRegister(left), ToOperand(right));
         }
       }
     }
     EmitBranch(true_block, false_block, cc);
   }
@@ skipping 3565 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64